SE2050408A1 - Heat recovery ventilation system - Google Patents

Heat recovery ventilation system

Info

Publication number
SE2050408A1
SE2050408A1 SE2050408A SE2050408A SE2050408A1 SE 2050408 A1 SE2050408 A1 SE 2050408A1 SE 2050408 A SE2050408 A SE 2050408A SE 2050408 A SE2050408 A SE 2050408A SE 2050408 A1 SE2050408 A1 SE 2050408A1
Authority
SE
Sweden
Prior art keywords
heat exchanger
heat
refrigerant
circuit
fluid
Prior art date
Application number
SE2050408A
Other versions
SE544273C2 (en
Inventor
Arne Moberg
Stefan Bredell
Original Assignee
Arne Moberg
Stefan Bredell
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arne Moberg, Stefan Bredell filed Critical Arne Moberg
Priority to SE2050408A priority Critical patent/SE544273C2/en
Publication of SE2050408A1 publication Critical patent/SE2050408A1/en
Publication of SE544273C2 publication Critical patent/SE544273C2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
    • F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
    • F24F12/002—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid
    • F24F12/003—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid using a heat pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D12/00—Other central heating systems
    • F24D12/02—Other central heating systems having more than one heat source
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D15/00—Other domestic- or space-heating systems
    • F24D15/04—Other domestic- or space-heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D5/00—Hot-air central heating systems; Exhaust gas central heating systems
    • F24D5/12—Hot-air central heating systems; Exhaust gas central heating systems using heat pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/30—Arrangement or mounting of heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B30/00—Heat pumps
    • F25B30/06—Heat pumps characterised by the source of low potential heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2203/00—Devices or apparatus used for air treatment
    • F24F2203/02—System or Device comprising a heat pump as a subsystem, e.g. combined with humidification/dehumidification, heating, natural energy or with hybrid system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0046—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater using natural energy, e.g. solar energy, energy from the ground
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/12—Hot water central heating systems using heat pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/56—Heat recovery units

Abstract

A heat recovery ventilation system (1) for a building (2) is described. The system (1) comprises: a first heat exchanger (3) arranged for heat exchange between an exhaust air flow from the building (2) and a fluid flowing in a fluid flow direction (f) in a fluid circuit (4), wherein the exhaust air flow is conveyed through an exhaust air conduit (5) in an exhaust air flow direction (a1), a second heat exchanger (6) arranged for heat exchange between an inlet air flow to the building (2) and the fluid flowing in the fluid circuit (4), wherein the inlet air flow is conveyed through an inlet air conduit (7) in an inlet air flow direction (a2), and a third heat exchanger (8) arranged downstream the second heat exchanger (6) in the inlet air flow direction (a2). The third heat exchanger (8) is arranged for heat exchange between the inlet air flow to the building (2) and a refrigerant flowing in a refrigerant flow direction (r) in a refrigerant circuit (9).

Description

Heat recovery ventilation system BACKGROUND OF THE INVENTION AND PRIOR ART The present invention relates to a heat recovery ventilation system for a buildingaccording to the preamble of claim l.
Generally, air in a building, such as a residential building or an office building,gradually becomes contaminated over time for various reasons, for instance by therespiration of people living or Working in the building. The pollution degree of theindoor air is higher than the outdoor air due to, inter alia, emissions of particles, gasesor heavy metals from materials used during construction of the building or fromfurniture, books, clothes or painted surfaces. Also, dust, bacteria or virus may be foundin the indoor air. Therefore, it is important to replace the contaminated indoor air Withfresh outdoor air continuously and with a relatively high flow to ensure a good indoorair quality. However, the fresh air needs to be heated or cooled to maintain the temperature of the indoor air, Which requires energy.
Efforts have been made to develop ventilation and heating systems for heating andventilating buildings in an efficient and cost-effective manner.
EP 2620715 is an example of a ventilation system With heat recovery. The systemcomprises an air/ air heat exchanger for heat transfer between air from a heated spaceand inlet air to the space. The system comprises a refrigerant circuit arranged such thatthe heat in the exhaust air is also recovered by the refrigerant circuit to heat the inlet airor to heat Water in a tank. The refrigerant circuit comprises a three Way valve arranged to enable either heating of the inlet air or heating of Water.
One disadvantage With the system described in EP 2620715 is that use of the air/airheat exchanger may cause contamination of the inlet air flow by, for example, bacteriaor virus, such as corona-virus, in the exhaust air flow. Thus, in case of several-familyhousings, hospitals or similar, use of the air/ air heat exchanger may contribute tospread of diseases Within the building. Further, in case of rooms/apartments connectedto a common ventilation system, the contaminated air from one room/apartment can be transferred to other rooms/apartments.
Also in, for example, run around heat recovery ventilation systems the inlet air flow can be contaminated by the exhaust air flow.
It is therefore desirable to provide an improved heat recovery ventilation system,regarding the contamination aspect of the inlet air flow, that enable heating andventilation of a building in an efficient way without need of using, for example, anair/air heat exchanger as in the EP 2620715. The present invention set out belowaddresses this desire.
SUMMARY OF THE INVENTION One object of the present invention is to provide an improved heat recovery ventilationsystem arranged to enable heating and ventilating of a building in a more efficientmanner comparing to systems known in the art without risks of contaminating of the fresh air supplied to the building by the exhaust air from the building.
The above mentioned object is achieved by the heat and recovery ventilation systemdefined in claim 1. The system can also be defined as a heat and ventilation systemwith heat recovery.
Thus, the above mentioned object is achieved by a heat recovery ventilation system fora building, wherein the system comprises: a first heat exchanger arranged for heatexchange between an exhaust air flow from the building and a fluid flowing in a fluidflow direction in a fluid circuit , wherein the exhaust air flow is conveyed through anexhaust air conduit in an exhaust air flow direction. Further, the system comprises asecond heat exchanger arranged for heat exchange between an inlet air flow to thebuilding and the fluid flowing in the fluid circuit, wherein the inlet air flow isconveyed through an inlet air conduit in an inlet air flow direction. Yet further, thesystem comprises and a third heat exchanger arranged downstream the second heatexchanger in the inlet air flow direction. In the system, the third heat exchanger isarranged for heat exchange between the inlet air flow to the building and a refrigerantflowing in a refrigerant flow direction in a refrigerant circuit comprising an expansionvalve, an evaporator and a compressor, wherein the expansion valve is arrangeddownstream the third heat exchanger and the compressor is arranged upstream thethird heat exchanger in the refrigerant flow direction. The evaporator is arranged downstream the expansion valve in the refrigerant flow direction. The refrigerantcircuit can also be defined as a heat pump circuit.
Because the second heat exchanger is arranged for heat exchange between the inlet airflow to the building and the fluid flowing in the fluid circuit and the third heatexchanger is arranged downstream the second heat exchanger in the inlet air flowdirection and is arranged for heat exchange between the inlet air flow to the buildingand the refrigerant flowing in the refrigerant circuit the inlet air can be heated orcooled by means of the fluid in the fluid circuit and/or by means of the refrigerant inthe refrigerant circuit. The fluid circuit is separated from the refrigerant circuit whichmeans that, there is no mixing of the fluid and the refrigerant in the system. The fluidand the refrigerant are different fluids in a chemical and physical meanings. Thus,depending on needs for heating or cooling of the building, the refrigerant circuit can beshut down and the building can be heated or cooled by means of the energy in the fluidin the fluid circuit. As a result the building can be heated or cooled in an efficient Iïlaflflef.
Further, because the system is arranged such as there is no heat exchange between theexhaust air from the building and the inlet air to the building, risks for contaminationof the inlet air by, for example bacteria or virus in the exhaust air, are eliminated.
Consequently, an improved heat and recovery ventilation system is provided, whichenables heating or cooling and ventilating of a building in a more efficient waycomparing to systems known in the art without risks of contamination of the inlet air tothe building by the exhaust air from the building.
According to an embodiment, the evaporator is arranged for heat exchange betweenthe refrigerant flowing in the refrigerant circuit and the fluid flowing in the fluidcircuit, wherein the evaporator is arranged downstream the second heat exchanger inthe fluid flow direction. Thus, the refrigerant can be evaporated by means of energy inthe fluid.
According to an embodiment, the evaporator is arranged for heat exchange betweenthe refrigerant flowing in the refrigerant circuit and the exhaust air flow from thebuilding, wherein the evaporator is arranged downstream the first heat exchanger in the exhaust air flow direction. Thus, the refrigerant can be evaporated by means of energyin the exhaust air flow from the building.
According to an embodiment, the system comprises a water storage tank, such as a hotwater storage tank, connected to the first heat exchanger Via a first tank circuit andconnected to the refrigerant circuit Via a second tank circuit, wherein the second tankcircuit is connected to the refrigerant circuit downstream the third heat exchanger inthe refrigerant flow direction. Thus, water in the water storage tank can be heated byenergy transferred from the refrigerant flowing downstream the third heat exchanger,in the refrigerant flow direction, which energy is transferred to the water in the waterstorage tank by means of the second tank circuit. Further, energy in the heated water inthe water storage tank can be transferred to the first heat exchanger by means of thefirst tank circuit in order to, for example, defrost the first heat exchanger. As a result, efficiency of the system can be improved thanks to the water storage tank.
According to an embodiment, the system comprises a fourth heat exchanger arrangedfor heat exchange between a fluid flowing in the second tank circuit and the refrigerantflowing in the refrigerant circuit, wherein the fourth heat exchanger is arrangeddownstream the third heat exchanger in the refrigerant flow direction. The fluidflowing in the second tank circuit may be the same as the refrigerant flowing in the refrigerant circuit.
According to an embodiment, the fourth heat exchanger is arranged for heat exchangebetween the fluid flowing in the fluid circuit and the refrigerant flowing in therefrigerant circuit, wherein the fourth heat exchanger is arranged downstream the evaporator and upstream the first heat exchanger in the fluid flow direction.
According to an embodiment, the system comprises a heat/cold source arranged fortransfer of heat or cold to/from the fluid circuit.
According to an embodiment, the heat/cold source is connected to the fluid circuitupstream the second heat exchanger and/or downstream the second heat exchanger inthe fluid flow direction.
According to an embodiment, the heat/cold source comprises at least one of: theground, a water reservoir, air or a convection heat source. The convection heat source may be a convector.
According to all the embodiments, the system does not comprise any air/air heatexchanger for heat exchange between the exhaust air flow from the building and theinlet air flow to the building. Thus, the system is an air - air interface free system. As aresult, risks for contamination of the inlet air flow by the exhaust air flow through such a heat exchanger are eliminated.
According to an embodiment, the system comprises at least one additional refrigerantcircuit connected in series, i.e. one after each other, or parallel to the refrigerant circuit.Thus, the system may comprise several refrigerant circuits connected to each other inseries or in parallel. In series, a condenser in one refrigerant circuit works as anevaporator in the next refrigerant circuit. When the several refrigerant circuits has beenconnected parallel to each other, several compressors can be used for each refrigerantcircuit, wherein the several compressors may have different sizes and levels ofperformance. As a result, a yet improved system can be achieved regarding efficiencyof the system and regarding use of the available energy in the system.
BRIEF DESCRIPTION OF THE DRAWINGS In the following preferred embodiments of the invention are described with referenceto the attached drawing, on which: Fig. l shows a schematic diagram of a heat recovery system according to anembodiment andFig. 2 shows a schematic diagram of a heat recovery system according to another embodiment.
DETAILLED DESCRIPTION OF PREFERRED EMBODIMENTS OF THEINVENTION Fig. l and Fig. 2 show a heat recovery ventilation system 1 for a building 2 accordingto some embodiments. The building 2 may be a residential building, an office building, a factory building, a hospital, a several-family building or another kind of building Where there is a need of ventilation.
The system 1 comprises a first heat exchanger 3 arranged for heat exchange betweenan exhaust air flow from the building 2 and a fluid flowing in a fluid flow direction f ina fluid Circuit 4, wherein the exhaust air flow is conveyed through an exhaust air Conduit 5 in an exhaust air flow direction al.
The fluid may comprise water with an anti-freezing medium, such as, for example an industrial alcohol or similar.
Further, the system 1 comprises a second heat exchanger 6 arranged for heat exchangebetween an inlet air flow to the building 2 and the fluid flowing in the fluid Circuit 4,wherein the inlet air flow is Conveyed through an inlet air conduit 7 in an inlet air flowdirection a2. As illustrated in Fig. 1 and Fig. 2 the system 1 comprises a third heatexchanger 8 arranged downstream the second heat exchanger 6 in the inlet air flowdirection a2. The third heat exchanger 8 is arranged for heat exchange between theinlet air flow to the building 2 and a refrigerant flowing in a refrigerant flow direction rin a refrigerant Circuit 9. Thus, the third heat exchanger 8 works as condenser for therefrigerant in the refrigerant Circuit 9. The refrigerant Circuit 9 Can also be defined as aheat pump Circuit and comprises an expansion Valve 10, an evaporator 11 and aCompressor 12. The expansion valve 10 is arranged downstream the third heatexchanger 8 and the Compressor 12 is arranged upstream the third heat exchanger 8 inthe refrigerant flow direction r. The evaporator 11 is arranged downstream theexpansion Valve 10 in the refrigerant flow direction r. The expansion valve 10, theevaporator 11 and the Compressor 12 work in a usual manner and are therefore not described in details herein.
The heat exchangers in the system 1 are Common heat exchangers in the area ofexChanging of heat and Can be flat heat exchangers or other suitable kinds of heatexchangers.
In the system 1 illustrated in Fig. 1, the evaporator 11 is arranged for heat exchangebetween the refrigerant flowing in the refrigerant Circuit 9 and the fluid flowing in thefluid Circuit 4, wherein the evaporator 11 is arranged downstream the second heatexchanger 6 in the fluid flow direction f.
The refrigerant may be R- l34A or other suitable refrigerant adapted for refrigerantsystems.
The system 1 may comprising a fourth heat exchanger 13 arranged for heat exchangebetween a fluid flowing in the second tank circuit 18 and the refrigerant flowing in therefrigerant circuit 9, wherein the fourth heat exchanger 13 is arranged downstream thethird heat exchanger 3 in the refrigerant flow direction r.
According to the embodiment illustrated in Fig. 1, the fourth heat exchanger 13 is alsoarranged for heat exchange between the fluid flowing in the fluid circuit 4 and therefrigerant flowing in the refrigerant circuit 9, Wherein the fourth heat exchanger 13 isarranged downstream the evaporator ll and upstream the first heat exchanger 3 in thefluid flow direction f.
The system 1 may further comprise a heat/cold source 14 arranged for transfer of heator cold to/from the fluid circuit 4, wherein the heat/cold source 14 may comprise atleast one of: the ground, a water reservoir, air or a convection heat source such as a convector.
As illustrated in Fig 1 and Fig. 2, the heat or cold from the source 14 can be suppliedto the fluid circuit 4 upstream the second heat exchanger 6 or downstream the secondheat exchanger 6, in the fluid flow direction f, depending on needs in the system 1. Theheat or cold from the source can be supplied by means of a source circuit 26 connectedto the source 14 and connected to the fluid circuit 4 by means of conduits and bymeans of multiway valves 21 arranged at connections between the source circuit 26and the fluid circuit 4. Thus, cold or heat can be supplied from the source 14 to thefluid circuit 4 in a simple manner. Further energy in the fluid flowing in the fluidcircuit 4 can be transferred to the inlet air flow through the second heat exchanger 6.Thus, the inlet air flow can be heated or cooled smoothly by using the energy inheat/cold source 14.
As illustrated in Fig. 1, the fluid circuit 4 may comprise a bypass conduit 15 arrangedto bypass at least a portion of the fluid past the evaporator 11 into the first heatexchanger 3. Thus, during a cold weather, an effective defrosting of the first heat exchanger 3 can be achieved by the at least portion of the fluid flowing into the firstheat exchanger 3 via the bypass conduit 15.
As illustrated in Fig. 1 and Fig. 2, the system 1 may comprise a receiver 19 arranged inthe refrigerant circuit 9 and arranged upstream the expansion valve 10 in therefrigerant flow direction r.
Further, the system may comprise a water storage tank 16, such as a hot water storagetank 16, connected to the first heat exchanger 3 via a first tank circuit 17 and connectedto the refrigerant circuit 9 via a second tank circuit 18. Thus, water in the waterstorage tank 16 can be heated by energy in the refrigerant in the refrigerant circuit 9.Further, the heated water in the water storage tank 16 can be used for defrosting of thefirst heat exchanger 3 in a simple an efficient manner through the first tank circuit 17.
The first heat exchanger 3 is arranged for three medium heat exchange, namely forheat exchange between the exhaust air flowing in exhaust air conduit 5, the fluidflowing in the fluid circuit 4 and water flowing in the first tank circuit 17. The secondtank circuit 18 is connected to the refrigerant circuit 9 downstream the third heatexchanger 8 in the refrigerant flow direction r. The second tank circuit 18 can bedirectly connected to the refrigerant circuit 9 or may be indirectly connected to therefrigerant circuit 9 via the fourth heat exchanger 13. The second tank circuit 18 isconnected by means of conduits and multiway valves 21 arranged to enable control ofthe flow of refrigerant in the second tank circuit 18 either by a direct connection withthe refrigerant circuit 9 or by an indirect connection with the refrigerant circuit 9through the fourth heat exchanger 13 where heat is exchanged between the refrigerant in the refrigerant circuit 9 and the refrigerant in the second tank circuit 19.
In Fig. 2 a heat recovery system 1 is illustrated in a schematic viewed according to anembodiment. The system 1 in Fig. 2 is similar to the system 1 illustrated in Fig. 1 andcomprises components of the system 1 as described in conjunction with Fig. 1.However, in the system 1 illustrated in Fig. 2 the evaporator 11 is arranged for heatexchange between the exhaust air flow from the building 2 and at least the refrigerantflowing in the refrigerant circuit 9, wherein the evaporator 11 is arranged downstreamthe first heat exchanger 3 in the exhaust air flow direction al. Thus, the evaporator 11is arranged for heat exchange between the exhaust air flow from the building 2 and therefrigerant flowing in the refrigerant circuit 9. The evaporator 11 is arranged for three medium heat exchange, namely for heat exchange between the exhaust air flowing inexhaust air conduit 5, the refrigerant flowing in the refrigerant circuit 9 and waterflowing in the first tank circuit 17. The first tank circuit 17 is also connected to the firstheat exchanger 3, downstream the evaporator ll in a direction of water flowing in thefirst tank circuit 17. Thus, both the evaporator ll and the first heat exchanger 3 can bedefrosted, when needed, by means of energy in Water flowing in the first tank circuit17.
According to the embodiments illustrated in Fig. 1 and in Fig 2, the system 1comprises a number of pumps 20, multiway valves 21 and check valves 22 arranged atsuitable positions in the system 1 to ensure a proper function of the system 1. Forsimplicity, only some of the components mentioned above have been illustrated in Fig.1 and Fig. 2.
Further, in Fig. 1 and 2 there are two fans 23 illustrated, arranged on the exhaust airconduit 5 and two fans 23 on the inlet air conduit 7. However, one fan 23 can be used on the exhaust air conduit 5 and one fan 23 can be used on the inlet air conduit 7.
The system 1 comprises an air filter 24 arranged on the inlet air conduit 7 and arrangedupstream the second heat exchanger 6 in the inlet air flow direction a2 and anadditional air filter 25 arranged on the exhaust air conduit 5 and arranged upstream thefirst heat exchanger 3 in the exhaust air flow direction al. Thus, the filters 24, 25 filterthe inlet air and the exhaust air as well as protect the fans and the heat exchangersarranged downstream of the filters 24, 25 from, for example dust or moisture.
In all embodiments of the invention the system 1 system 1 do not comprise any air/airheat exchanger for heat exchange between the exhaust air flow from the building 2 andthe inlet air flow to the building 2. Thus, risks for contamination of the inlet air by, forexample bacteria or virus in the exhaust air, are eliminated.
The invention is not restricted to the described embodiment but may be varied freely atthe scope of the claims. The sizes of the components of the systems depicted in thefigures is a schematic illustration and does not correspond to the real sizes of the components.

Claims (10)

Claims
1. A heat recovery Ventilation system (1) for a building (2), wherein the system (1)comprises: a first heat exchanger (3) arranged for heat exchange between an exhaust air flowfrom said building (2) and a fluid flowing in a fluid flow direction (f) in a fluid circuit(4), wherein the exhaust air flow is conveyed through an exhaust air conduit (5) in anexhaust air flow direction (al), a second heat exchanger (6) arranged for heat exchange between an inlet air flowto said building (2) and said fluid flowing in the fluid circuit (4), wherein the inlet airflow is conveyed through an inlet air conduit (7) in an inlet air flow direction (a2), and a third heat exchanger (8) arranged downstream said second heat exchanger (6)in the inlet air flow direction (a2),characterized in that, said third heat exchanger (8) is arranged for heat exchangebetween the inlet air flow to the building (2) and a refrigerant flowing in a refrigerantflow direction (r) in a refrigerant circuit (9) comprising an expansion valve (10), anevaporator (11) and a compressor (12), wherein the expansion valve (10) is arrangeddownstream said third heat exchanger (8) and the compressor (12) is arrangedupstream said third heat exchanger (8) in the refrigerant flow direction (r).
2. The system (1) according to claim 1, wherein said evaporator(11) is arranged forheat exchange between the refrigerant flowing in the refrigerant circuit (9) and thefluid flowing in the fluid circuit (4), wherein said evaporator (11) is arrangeddownstream said second heat exchanger (6) in the fluid flow direction (f).
3. The system according to claim 1, wherein said evaporator (11) is arranged for heatexchange between the refrigerant flowing in the refrigerant circuit (9) and the exhaustair flow from the building (2), wherein said evaporator(11) is arranged downstream said first heat exchanger (3) in the exhaust air flow direction (al).
4. The system (1) according to any of claims 1 to 3, comprising a water storage tank(16) connected to the first heat exchanger (3) via a first tank circuit (17) and connectedto the refrigerant circuit (9) Via a second tank circuit (18), wherein said second tankcircuit (18) is connected to the refrigerant circuit (9) downstream said third heatexchanger (8) in the refrigerant flow direction (r).
5. The system (1) according to claim 4, comprising a fourth heat exchanger (13)arranged for heat exchange between a fluid flowing in said second tank circuit (18) andthe refrigerant flowing in the refrigerant circuit (9), wherein said fourth heat exchanger(13) is arranged downstream said third heat exchanger (3) in the refrigerant flowdirection (r).
6. The system (1) according to claim 5, wherein said fourth heat exchanger (13) isarranged for heat exchange between the fluid flowing in the fluid circuit (4) and therefrigerant flowing in the refrigerant circuit (9), wherein the fourth heat exchanger ( 13)is arranged downstream said evaporator (11) and upstream said first heat exchanger (3)in the fluid flow direction (f).
7. The system (1) according to any of claims 1 to 6, comprising a heat/cold source (14) arranged for transfer of heat or cold to/from said fluid circuit (4).
8. The system (1) according to claim 7, wherein said heat/cold source (14) is connectedto said fluid circuit (4) upstream said second heat exchanger (6) and/or downstreamsaid second heat exchanger (6) in the fluid flow direction (f).
9. The system (1) according to claims 7 or 8, wherein said heat/cold source (14)comprises at least one of: the ground, a water reservoir, air or a convection heat source.
10. The system (1) according to any of claims 1 to 9, wherein the system (1) does notcomprise any air/ air heat exchanger for heat exchange between the exhaust air flowfrom the building (2) and the inlet air flow to the building (2).
SE2050408A 2020-04-09 2020-04-09 Heat recovery ventilation system SE544273C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE2050408A SE544273C2 (en) 2020-04-09 2020-04-09 Heat recovery ventilation system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE2050408A SE544273C2 (en) 2020-04-09 2020-04-09 Heat recovery ventilation system

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SE2050408A1 true SE2050408A1 (en) 2021-10-10
SE544273C2 SE544273C2 (en) 2022-03-22

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SE2050408A SE544273C2 (en) 2020-04-09 2020-04-09 Heat recovery ventilation system

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877515A (en) * 1969-06-17 1975-04-15 Nikolaus Laing Temperature-control system with rotary heat exchangers
SE459119B (en) * 1986-09-03 1989-06-05 Mj Gravyr Handelsbolag Ventilation heat recovery system
US20110041534A1 (en) * 2007-12-07 2011-02-24 Heinz-Dieter Hombucher Device for increasing the heating and cooling output of a heat pump in heat reclamation in air conditioning units
EP3096089A1 (en) * 2015-04-07 2016-11-23 Ensto Enervent Oy Ab System for controlling the energy balance of a property
EP3453980A2 (en) * 2017-08-14 2019-03-13 Ika-Air Oy Heat exchanger radiator, ventilation arrangement of building, and method for using ventilation arrangement of building

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3877515A (en) * 1969-06-17 1975-04-15 Nikolaus Laing Temperature-control system with rotary heat exchangers
SE459119B (en) * 1986-09-03 1989-06-05 Mj Gravyr Handelsbolag Ventilation heat recovery system
US20110041534A1 (en) * 2007-12-07 2011-02-24 Heinz-Dieter Hombucher Device for increasing the heating and cooling output of a heat pump in heat reclamation in air conditioning units
EP3096089A1 (en) * 2015-04-07 2016-11-23 Ensto Enervent Oy Ab System for controlling the energy balance of a property
EP3453980A2 (en) * 2017-08-14 2019-03-13 Ika-Air Oy Heat exchanger radiator, ventilation arrangement of building, and method for using ventilation arrangement of building

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